import type { IDataObject, INode } from 'n8n-workflow';
import { NodeOperationError } from 'n8n-workflow';
import pgPromise from 'pg-promise';

import type { ColumnInfo } from '../../v2/helpers/interfaces';
import {
	addSortRules,
	addReturning,
	addWhereClauses,
	checkItemAgainstSchema,
	parsePostgresError,
	prepareErrorItem,
	prepareItem,
	replaceEmptyStringsByNulls,
	wrapData,
	convertArraysToPostgresFormat,
	isJSON,
	convertValuesToJsonWithPgp,
	hasJsonDataTypeInSchema,
	evaluateExpression,
} from '../../v2/helpers/utils';

const node: INode = {
	id: '1',
	name: 'Postgres node',
	typeVersion: 2,
	type: 'n8n-nodes-base.postgres',
	position: [60, 760],
	parameters: {
		operation: 'executeQuery',
	},
};

describe('Test PostgresV2, isJSON', () => {
	it('should return true for valid JSON', () => {
		expect(isJSON('{"key": "value"}')).toEqual(true);
	});
	it('should return false for invalid JSON', () => {
		expect(isJSON('{"key": "value"')).toEqual(false);
	});
});

describe('Test PostgresV2, evaluateExpression', () => {
	it('should evaluate undefined to an empty string', () => {
		expect(evaluateExpression(undefined)).toEqual('');
	});
	it('should evaluate null to a string with value null', () => {
		expect(evaluateExpression(null)).toEqual('null');
	});
	it('should evaluate object to a string', () => {
		expect(evaluateExpression({ key: '' })).toEqual('{"key":""}');
		expect(evaluateExpression([])).toEqual('[]');
		expect(evaluateExpression([1, 2, 4])).toEqual('[1,2,4]');
	});
	it('should evaluate everything else to a string', () => {
		expect(evaluateExpression(1)).toEqual('1');
		expect(evaluateExpression('string')).toEqual('string');
		expect(evaluateExpression(true)).toEqual('true');
	});
});

describe('Test PostgresV2, wrapData', () => {
	it('should wrap object in json', () => {
		const data = {
			id: 1,
			name: 'Name',
		};
		const wrappedData = wrapData(data);
		expect(wrappedData).toBeDefined();
		expect(wrappedData).toEqual([{ json: data }]);
	});
	it('should wrap each object in array in json', () => {
		const data = [
			{
				id: 1,
				name: 'Name',
			},
			{
				id: 2,
				name: 'Name 2',
			},
		];
		const wrappedData = wrapData(data);
		expect(wrappedData).toBeDefined();
		expect(wrappedData).toEqual([{ json: data[0] }, { json: data[1] }]);
	});
	it('json key from source should be inside json', () => {
		const data = {
			json: {
				id: 1,
				name: 'Name',
			},
		};
		const wrappedData = wrapData(data);
		expect(wrappedData).toBeDefined();
		expect(wrappedData).toEqual([{ json: data }]);
		expect(Object.keys(wrappedData[0].json)).toContain('json');
	});
});

describe('Test PostgresV2, prepareErrorItem', () => {
	it('should return error info item', () => {
		const items = [
			{
				json: {
					id: 1,
					name: 'Name 1',
				},
			},
			{
				json: {
					id: 2,
					name: 'Name 2',
				},
			},
		];

		const error = new Error('Test error');
		const item = prepareErrorItem(items, error, 1);
		expect(item).toBeDefined();

		expect((item.json.item as IDataObject)?.id).toEqual(2);
		expect(item.json.message).toEqual('Test error');
		expect(item.json.error).toBeDefined();
	});
});

describe('Test PostgresV2, parsePostgresError', () => {
	it('should return NodeOperationError', () => {
		const error = new Error('Test error');

		const parsedError = parsePostgresError(node, error, [], 1);
		expect(parsedError).toBeDefined();
		expect(parsedError.message).toEqual('Test error');
		expect(parsedError instanceof NodeOperationError).toEqual(true);
	});

	it('should update message that includes ECONNREFUSED', () => {
		const error = new Error('ECONNREFUSED');

		const parsedError = parsePostgresError(node, error, [], 1);
		expect(parsedError).toBeDefined();
		expect(parsedError.message).toEqual('Connection refused');
		expect(parsedError instanceof NodeOperationError).toEqual(true);
	});

	it('should update message with syntax error', () => {
		// eslint-disable-next-line n8n-local-rules/no-unneeded-backticks
		const errorMessage = String.raw`syntax error at or near "select"`;
		const error = new Error();
		error.message = errorMessage;

		const parsedError = parsePostgresError(node, error, [
			{ query: 'select * from my_table', values: [] },
		]);
		expect(parsedError).toBeDefined();
		expect(parsedError.message).toEqual('Syntax error at line 1 near "select"');
		expect(parsedError instanceof NodeOperationError).toEqual(true);
	});
});

describe('Test PostgresV2, addWhereClauses', () => {
	it('should add where clauses to query', () => {
		const query = 'SELECT * FROM $1:name.$2:name';
		const values = ['public', 'my_table'];
		const whereClauses = [{ column: 'id', condition: 'equal', value: '1' }];

		const [updatedQuery, updatedValues] = addWhereClauses(
			node,
			0,
			query,
			whereClauses,
			values,
			'AND',
		);

		expect(updatedQuery).toEqual('SELECT * FROM $1:name.$2:name WHERE $3:name = $4');
		expect(updatedValues).toEqual(['public', 'my_table', 'id', '1']);
	});

	it('should combine where clauses by OR', () => {
		const query = 'SELECT * FROM $1:name.$2:name';
		const values = ['public', 'my_table'];
		const whereClauses = [
			{ column: 'id', condition: 'equal', value: '1' },
			{ column: 'foo', condition: 'equal', value: 'select 2' },
		];

		const [updatedQuery, updatedValues] = addWhereClauses(
			node,
			0,
			query,
			whereClauses,
			values,
			'OR',
		);

		expect(updatedQuery).toEqual(
			'SELECT * FROM $1:name.$2:name WHERE $3:name = $4 OR $5:name = $6',
		);
		expect(updatedValues).toEqual(['public', 'my_table', 'id', '1', 'foo', 'select 2']);
	});

	it('should ignore incorrect combine condition ad use AND', () => {
		const query = 'SELECT * FROM $1:name.$2:name';
		const values = ['public', 'my_table'];
		const whereClauses = [
			{ column: 'id', condition: 'equal', value: '1' },
			{ column: 'foo', condition: 'equal', value: 'select 2' },
		];

		const [updatedQuery, updatedValues] = addWhereClauses(
			node,
			0,
			query,
			whereClauses,
			values,
			'SELECT * FROM my_table',
		);

		expect(updatedQuery).toEqual(
			'SELECT * FROM $1:name.$2:name WHERE $3:name = $4 AND $5:name = $6',
		);
		expect(updatedValues).toEqual(['public', 'my_table', 'id', '1', 'foo', 'select 2']);
	});
});

describe('Test PostgresV2, addSortRules', () => {
	it('should ORDER BY ASC', () => {
		const query = 'SELECT * FROM $1:name.$2:name';
		const values = ['public', 'my_table'];
		const sortRules = [{ column: 'id', direction: 'ASC' }];

		const [updatedQuery, updatedValues] = addSortRules(query, sortRules, values);

		expect(updatedQuery).toEqual('SELECT * FROM $1:name.$2:name ORDER BY $3:name ASC');
		expect(updatedValues).toEqual(['public', 'my_table', 'id']);
	});
	it('should ORDER BY DESC', () => {
		const query = 'SELECT * FROM $1:name.$2:name';
		const values = ['public', 'my_table'];
		const sortRules = [{ column: 'id', direction: 'DESC' }];

		const [updatedQuery, updatedValues] = addSortRules(query, sortRules, values);

		expect(updatedQuery).toEqual('SELECT * FROM $1:name.$2:name ORDER BY $3:name DESC');
		expect(updatedValues).toEqual(['public', 'my_table', 'id']);
	});
	it('should ignore incorrect direction', () => {
		const query = 'SELECT * FROM $1:name.$2:name';
		const values = ['public', 'my_table'];
		const sortRules = [{ column: 'id', direction: 'SELECT * FROM my_table' }];

		const [updatedQuery, updatedValues] = addSortRules(query, sortRules, values);

		expect(updatedQuery).toEqual('SELECT * FROM $1:name.$2:name ORDER BY $3:name ASC');
		expect(updatedValues).toEqual(['public', 'my_table', 'id']);
	});
	it('should add multiple sort rules', () => {
		const query = 'SELECT * FROM $1:name.$2:name';
		const values = ['public', 'my_table'];
		const sortRules = [
			{ column: 'id', direction: 'ASC' },
			{ column: 'foo', direction: 'DESC' },
		];

		const [updatedQuery, updatedValues] = addSortRules(query, sortRules, values);

		expect(updatedQuery).toEqual(
			'SELECT * FROM $1:name.$2:name ORDER BY $3:name ASC, $4:name DESC',
		);
		expect(updatedValues).toEqual(['public', 'my_table', 'id', 'foo']);
	});
});

describe('Test PostgresV2, addReturning', () => {
	it('should add RETURNING', () => {
		const query = 'UPDATE $1:name.$2:name SET $5:name = $6 WHERE $3:name = $4';
		const values = ['public', 'my_table', 'id', '1', 'foo', 'updated'];
		const outputColumns = ['id', 'foo'];

		const [updatedQuery, updatedValues] = addReturning(query, outputColumns, values);

		expect(updatedQuery).toEqual(
			'UPDATE $1:name.$2:name SET $5:name = $6 WHERE $3:name = $4 RETURNING $7:name',
		);
		expect(updatedValues).toEqual([
			'public',
			'my_table',
			'id',
			'1',
			'foo',
			'updated',
			['id', 'foo'],
		]);
	});
	it('should add RETURNING *', () => {
		const query = 'UPDATE $1:name.$2:name SET $5:name = $6 WHERE $3:name = $4';
		const values = ['public', 'my_table', 'id', '1', 'foo', 'updated'];
		const outputColumns = ['id', 'foo', '*'];

		const [updatedQuery, updatedValues] = addReturning(query, outputColumns, values);

		expect(updatedQuery).toEqual(
			'UPDATE $1:name.$2:name SET $5:name = $6 WHERE $3:name = $4 RETURNING *',
		);
		expect(updatedValues).toEqual(['public', 'my_table', 'id', '1', 'foo', 'updated']);
	});
});

describe('Test PostgresV2, replaceEmptyStringsByNulls', () => {
	it('should replace empty string by null', () => {
		const items = [
			{ json: { foo: 'bar', bar: '', spam: undefined } },
			{ json: { foo: '', bar: '', spam: '' } },
			{ json: { foo: 0, bar: NaN, spam: false } },
		];

		const updatedItems = replaceEmptyStringsByNulls(items, true);

		expect(updatedItems).toBeDefined();
		expect(updatedItems).toEqual([
			{ json: { foo: 'bar', bar: null, spam: undefined } },
			{ json: { foo: null, bar: null, spam: null } },
			{ json: { foo: 0, bar: NaN, spam: false } },
		]);
	});
	it('should do nothing', () => {
		const items = [
			{ json: { foo: 'bar', bar: '', spam: undefined } },
			{ json: { foo: '', bar: '', spam: '' } },
			{ json: { foo: 0, bar: NaN, spam: false } },
		];

		const updatedItems = replaceEmptyStringsByNulls(items);

		expect(updatedItems).toBeDefined();
		expect(updatedItems).toEqual(items);
	});
});

describe('Test PostgresV2, prepareItem', () => {
	it('should convert fixedCollection values to object', () => {
		const values = [
			{
				column: 'id',
				value: '1',
			},
			{
				column: 'foo',
				value: 'bar',
			},
			{
				column: 'bar',
				value: 'foo',
			},
		];

		const item = prepareItem(values);

		expect(item).toBeDefined();
		expect(item).toEqual({
			id: '1',
			foo: 'bar',
			bar: 'foo',
		});
	});
});

describe('Test PostgresV2, checkItemAgainstSchema', () => {
	it('should not throw error', () => {
		const item = { foo: 'updated', id: 2 };
		const columnsInfo = [
			{ column_name: 'id', data_type: 'integer', is_nullable: 'NO' },
			{ column_name: 'json', data_type: 'json', is_nullable: 'NO' },
			{ column_name: 'foo', data_type: 'text', is_nullable: 'NO' },
		];

		const result = checkItemAgainstSchema(node, item, columnsInfo, 0);

		expect(result).toBeDefined();
		expect(result).toEqual(item);
	});
	it('should throw error on not existing column', () => {
		const item = { foo: 'updated', bar: 'updated' };
		const columnsInfo = [
			{ column_name: 'id', data_type: 'integer', is_nullable: 'NO' },
			{ column_name: 'json', data_type: 'json', is_nullable: 'NO' },
			{ column_name: 'foo', data_type: 'text', is_nullable: 'NO' },
		];

		try {
			checkItemAgainstSchema(node, item, columnsInfo, 0);
		} catch (error) {
			expect(error.message).toEqual("Column 'bar' does not exist in selected table");
		}
	});
	it('should throw error on not nullable column', () => {
		const item = { foo: null };
		const columnsInfo = [
			{ column_name: 'id', data_type: 'integer', is_nullable: 'NO' },
			{ column_name: 'foo', data_type: 'text', is_nullable: 'NO' },
		];

		try {
			checkItemAgainstSchema(node, item, columnsInfo, 0);
		} catch (error) {
			expect(error.message).toEqual("Column 'foo' is not nullable");
		}
	});
});

describe('Test PostgresV2, hasJsonDataType', () => {
	it('returns true if there are columns which are of type json', () => {
		const schema: ColumnInfo[] = [
			{ column_name: 'data', data_type: 'json', is_nullable: 'YES' },
			{ column_name: 'id', data_type: 'integer', is_nullable: 'NO' },
		];

		expect(hasJsonDataTypeInSchema(schema)).toEqual(true);
	});

	it('returns false if there are columns which are of type json', () => {
		const schema: ColumnInfo[] = [{ column_name: 'id', data_type: 'integer', is_nullable: 'NO' }];

		expect(hasJsonDataTypeInSchema(schema)).toEqual(false);
	});
});

describe('Test PostgresV2, convertValuesToJsonWithPgp', () => {
	const pgp = pgPromise();
	const pgpJsonSpy = jest.spyOn(pgp.as, 'json');
	const schema: ColumnInfo[] = [
		{ column_name: 'data', data_type: 'json', is_nullable: 'YES' },
		{ column_name: 'id', data_type: 'integer', is_nullable: 'NO' },
	];

	beforeEach(() => {
		pgpJsonSpy.mockClear();
	});

	it.each([
		{
			value: { data: [], id: 1 },
			expected: { data: '[]', id: 1 },
		},
		{
			value: { data: [0], id: 1 },
			expected: { data: '[0]', id: 1 },
		},
		{
			value: { data: { key: 2 }, id: 1 },
			expected: { data: '{"key":2}', id: 1 },
		},
		{
			value: { data: null, id: 1 },
			expected: { data: null, id: 1 },
			shouldSkipPgp: true,
		},
		{
			value: { data: undefined, id: 1 },
			expected: { data: undefined, id: 1 },
			shouldSkipPgp: true,
		},
	])('should convert $value.data to json correctly', ({ value, expected, shouldSkipPgp }) => {
		const data = value.data;
		expect(convertValuesToJsonWithPgp(pgp, schema, value)).toEqual(expected);
		expect(value).toEqual(expected);
		if (!shouldSkipPgp) {
			expect(pgpJsonSpy).toHaveBeenCalledWith(data, true);
		}
	});
});

describe('Test PostgresV2, convertArraysToPostgresFormat', () => {
	it('should convert js arrays to postgres format', () => {
		const item = {
			jsonb_array: [
				{
					key: 'value44',
				},
			],
			json_array: [
				{
					key: 'value54',
				},
			],
			int_array: [1, 2, 5],
			text_array: ['one', 't"w"o'],
			bool_array: [true, false],
		};

		const schema: ColumnInfo[] = [
			{
				column_name: 'id',
				data_type: 'integer',
				is_nullable: 'NO',
				udt_name: 'int4',
				column_default: "nextval('test_data_array_id_seq'::regclass)",
			},
			{
				column_name: 'jsonb_array',
				data_type: 'ARRAY',
				is_nullable: 'YES',
				udt_name: '_jsonb',
				column_default: null,
			},
			{
				column_name: 'json_array',
				data_type: 'ARRAY',
				is_nullable: 'YES',
				udt_name: '_json',
				column_default: null,
			},
			{
				column_name: 'int_array',
				data_type: 'ARRAY',
				is_nullable: 'YES',
				udt_name: '_int4',
				column_default: null,
			},
			{
				column_name: 'bool_array',
				data_type: 'ARRAY',
				is_nullable: 'YES',
				udt_name: '_bool',
				column_default: null,
			},
			{
				column_name: 'text_array',
				data_type: 'ARRAY',
				is_nullable: 'YES',
				udt_name: '_text',
				column_default: null,
			},
		];

		const result = convertArraysToPostgresFormat(item, schema, node, 0);

		expect(result).toEqual({
			jsonb_array: '{"{\\"key\\":\\"value44\\"}"}',
			json_array: '{"{\\"key\\":\\"value54\\"}"}',
			int_array: '{1,2,5}',
			text_array: '{"one","t\\"w\\"o"}',
			bool_array: '{"true","false"}',
		});
	});

	it('should not modify the original data object', () => {
		const referenceItem = {
			arr: [1, 2, 3],
		};
		const item = {
			arr: [1, 2, 3],
		};
		const schema: ColumnInfo[] = [
			{
				column_name: 'arr',
				data_type: 'ARRAY',
				is_nullable: 'YES',
				udt_name: '_int4',
				column_default: null,
			},
		];

		const result = convertArraysToPostgresFormat(item, schema, node, 0);

		expect(result).toEqual({
			arr: '{1,2,3}',
		});
		expect(item).toEqual(referenceItem);
	});
});
